US7664354B2 - System and method for loose tube tight buffer indoor/outdoor optical fiber cable - Google Patents
System and method for loose tube tight buffer indoor/outdoor optical fiber cable Download PDFInfo
- Publication number
- US7664354B2 US7664354B2 US11/600,932 US60093206A US7664354B2 US 7664354 B2 US7664354 B2 US 7664354B2 US 60093206 A US60093206 A US 60093206A US 7664354 B2 US7664354 B2 US 7664354B2
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- water swellable
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
- G02B6/56—Processes for repairing optical cables
- G02B6/562—Processes for repairing optical cables locatable, e.g. using magnetic means
Definitions
- the present invention is related to fiber optic cables. More particularly, the present invention relates to tight buffer optical fibers in a loose tube fiber cable arrangement.
- loose tube refers to the fact that the fibers are arranged loosely within a larger outer sheath or jacket.
- the fibers can either be basic optical fibers (having only the standard 250 micro UV coating) or “tight buffer” optical fibers (having an additional polymer coating totaling 900 microns over the basic UV coating).
- FIG. 1 shows an aerial drop cable having two strength rods, one on either side of the tight buffer optical fiber and a gel for protecting the fibers.
- the stiff rods are prone to moisture breakdown and fracture, resulting in potential breakage in tight diameter coiling (eg. 6′′ diameter). Multiple bends of such cable can also result in pinching or compressing of the central fiber. Cables of this design are ill suited for multiple 90 degree, small diameter, bends in excess of two before GRP (Glass Reinforced Plastic) fracture and then resulting in significant attenuation in the fibers.
- GRP Glass Reinforced Plastic
- Aerial drop cables tend to be too-flexible to be forced through the building conduit and cables using more rigid strength members suffer from the opposite drawback, namely being too sturdy to easily navigate dense conduits.
- the typical side by side addition of a tone wire (used for detection of buried or hidden cable) in a flat drop cable may also add additional bulk which further interferes with movement through the conduits through the dwelling unit.
- the gel used in these cables acts to hold the strain in the fibers long after installation. This fiber strain takes time to adjust, over months or even years, so that the fibers can relax relative to the cable jacket. This strain relief or fiber migration may easily result in a slow pulling from the ends of the fiber from their connection points.
- an installer may typically use loops on the poles to prevent fiber migration within the cables caused by the fiber strain imparted during installation.
- the loops themselves also work to maintain additional unwanted tension in the fibers.
- This arrangement requires additional cable strength to compensate for the added locked in fiber strain, adding cost and weight to the product, not to mention the use of extra cable adding cost and cluttering the cables on the pole.
- these lock-in-loops set up a high bending stress scenario for the grp (glass reinforced polymer) rods in the flat drop cable which, when these grp rods are exposed to humidity migration through the jacket over time, begin to loose their integrity and begin to fracture from this coil stress. This results in cable failure and fiber attenuation or breakage.
- the present invention looks to overcome the drawbacks associated with the prior art and provide a loose tube optical fiber cable that is loose, relative to the outer jacket so that there is little or no installation tension or fiber strain imparted to the fibers during installation and twisting, eliminating the need for coiling to prevent migration from relaxing fiber strain by allowing for free rotational movement of the fibers inside the loose tube during installation.
- the present invention is directed to a fiber cable having at least one fiber optic element, a water swellable powder, disposed on the fiber optic element and a tube surrounding the fiber element and the water swellable powder.
- the fiber optic element is in a loose non-coupled arrangement with respect to the inside of the tube such that during installation, mechanical installation stresses applied to the cable and the tube are not imparted to the fiber optic element therein.
- FIG. 1 illustrates a prior art cable
- FIG. 2 illustrates a prior art cable on a pole
- FIG. 3 illustrates a sample single fiber cable, in accordance with one embodiment of the present invention
- FIG. 4 illustrates a sample two fiber cable, in accordance with one embodiment of the present invention
- FIG. 5 illustrates a sample two fiber cable with an additional strength yarn, in accordance with another embodiment of the present invention
- FIGS. 6A-6C illustrate a progression of bending the cable from FIG. 4 , in accordance with one embodiment of the present invention.
- FIG. 7 illustrates a cable on a pole, in accordance with one embodiment of the present invention.
- a loose tube fiber optic cable 10 is provided.
- Cable 10 maintains a first tight buffer optical fiber 12 , surrounded a by a water swellable powder 16 .
- Tight buffer optical fiber 12 is preferably a typical tight buffer fiber having a UV coated fiber core surrounded by a polymer layer totaling approximately 900 microns in diameter.
- Water swellable powder 16 is preferably a SAP (Super Absorbing Polymer) such as CABLOCTM, however the invention is not limited in this respect.
- FIG. 4 In another preferred embodiment, as illustrated in FIG. 4 , two tight buffer optical fibers 12 a and 12 b are shown, again surrounded by water swellable powder 16 .
- the two fiber arrangement of FIG. 4 will be used to discuss the salient features of the present invention. However, all features discussed herein are equally applicable in both arrangements.
- water swellable powder 16 may act as both a moisture absorption element in the case of a breach of cable 10 to protect fiber 12 , as well as a lubricant to allow smooth unimpeded longitudinal movement between fiber 12 and the inside diameter of loose tube 20 as discussed in more detail below.
- Powder 16 is applied to tight buffers 12 as they enter tube 20 , but powder 16 may be allowed to shake off and typically resides in a predictable balance of powder 16 to surface area on the interior of tube 20 and the outer surface(s) of tight buffers 12 .
- the inside of tube 20 preferably maintains a scattering of powder 16 particles approximately 50 to 150 microns apart on the interior of tube 20 .
- Loose tube 20 Surrounding optical fibers 12 a and 12 b is a loose tube 20 , preferably having an inner diameter of 2 mm, and an outer diameter of 3 mm.
- Loose tube 20 is preferably constructed of a low modulus FRPVC (Fire Resistant Poly Vinyl Chloride) however the invention is not limited in this respect.
- Low modulus polymer in this instance refers to a polymer having a Young's modulus substantially in the range of 250-750 N/mm 2 . Any suitable polymer may be used provided it meets the necessary fire safety and constructions standards.
- loose tube refers to the loose nature of the loose tube 20 with relation to the tight buffer fibers 12 contained therein.
- a plurality of water swellable strength yarns 22 are arranged to provide tensile strength to cable 10 as well as added water resistance.
- an exemplary material for yarns 22 are Neptco 785 GTM, a water swellable-coated fiberglass yarn 22 originally developed by Owens Corning® as OC 785 GTM and then sold to Neptco®, who is the current distributor.
- yarn 22 is fed into tube 20 straight, ultimately making a 1:1 engagement of strength yarns 22 to cable strain under pulling tensile, minimizing the helical engagement lag of the stranded aramid yarns used in a typical premises application.
- the small yarns 22 also avoid the rigid inflexibility as found in the grp used in the flat drop cable 10 .
- a metal wire such as a 24 gauge (American Wire Gauge) may be employed in yarns 22 to make sure that the compact round shape of cable 10 , as shown in FIGS. 3 and 4 , is maintained.
- a ripcord 24 may be optionally added for easily removing the outer jacket.
- a tone conductor 26 may be optionally added for locating cable 10 in buried applications to avoid cutting cable 10 in later excavations, and could also be used in any other manner that one could expect from a 26 AWG tined, coated copper stranded conductor, or any suitable conductor.
- an outer jacket 30 Surrounding the yarns 22 , ripcord 24 and tone conductor 26 , arranged around the outside diameter of loose tube 20 , an outer jacket 30 is disposed over the top as an additional protection for cable 10 (water resistance and crush protection) and to secure the strength yarns 22 in place.
- Outer jacket 30 is preferably constructed of the same FRPVC as loose tube 20 , however the invention is not limited in this respect.
- an optional water swellable yarn 28 or NWS yarn may be used so as to allow powder 16 to be carried along with tight buffers 12 as they enter tube 20 .
- NWS yarn non water swellable yarn
- These yarn(s) 28 may be added inside of loose tube 20 to assist in carrying more water swellable powder 16 around tight buffer fibers 12 a and 12 b , and also to add additional moisture protection and tensile strength.
- loose tube 20 maintains an inner diameter of approximately 2 mm.
- the two fibers 12 a and 12 b each have a diameter of 900 microns.
- the inner diameter of tight buffer 20 is approximately 10% larger than the (+/ ⁇ 2%) of the total combined diameter of fibers 12 a and 12 b.
- the tight buffers 12 can slide along the length of cable 10 during installation so that they can return to a relaxed state with respect to tube 20 of cable 10 , in a relatively short period of time.
- This is in sharp contrast to prior art cables using tightly wrapped aramid or gel filled designs where during installation, various tensions and outside forces are transmitted to the interior fibers or tight buffers.
- Installers attempt various mitigations to momentarily prevent this relaxation only prolonging the problems. For example, as shown in FIG. 2 , locking in the fiber with loops only slowed the fiber migration to relaxation. Because of this installation strain, the wrapped aramid fibers of the prior art may provide prolonged strain on the fiber leading to a fiber break.
- the arrangement of the present invention overcomes such drawbacks by allowing movement of the fibers, tight buffers 12 within the tube 20 , preventing breaks caused by tube 20 elongation or compression/collapse during pushing into a conduit.
- Another advantage of the present design is that its minimal rigidity provides the right balance of rigidity (from yarn 22 placement and use of low modulus plastic) to allow stuffing the cable upward into conduits and yet is sufficiently flexible so as to be easily bent compared to the two extremes (rigid) of the prior art flat drop and typical (too flexible) premises cable.
- Another advantage of the 10% clearance between the outer diameter of fibers 12 and inner diameter of tube 20 of the present arrangement is that it provides a safe allowance to give tight buffers 12 room to move within tube 20 .
- This diameter variation provides some minimal contact and the compressibility of the low modulus PVC used for tube 20 minimizes the normal force on tight buffers 12 where this minimal friction prevents tight buffer fibers 12 from literally falling out of the cable while allowing differential length adjustment.
- This feature of the present invention is particularly useful in when there are only two constituents within tube 20 , where contact with the inner wall of tube 20 is the critical element that must be minimized.
- Powder 16 while acting as a swelling water block also acts as a friction reducer in allowing tight buffers 12 to move within tube 20 .
- the use of tight buffers 12 with additional powder 16 coating over fibers 12 reduces fibers 12 attenuation sensitivity or glass deformation due the shape of the water swellable powder 16 particles, or “rocks,” themselves.
- Typical size of powder 16 particles is 0-50 microns for fibers with 0-150 micron particle outer diameters possible with tight buffers 12 .
- the preferable power 16 particle size is 0-50 micron particle (outside diameter) for both tight buffer and non-tight buffer fiber applications to minimize attenuation or glass deformation of either design. Any glass deflection or deformation exceeding approximately 14 degrees will inadvertently allow light to be reflected out of the glass or light lost which is the meaning of “attenuation.”
- a first advantage of this arrangement is that the powder filled loose tube 20 allows for compression and improved bend movements of more than two 90 degree angle bends without inducing attenuation in fibers 12 . This is further facilitated by the use of water swellable yarns 22 instead of the strength rods used in the prior art.
- the present invention although capable of maintaining a compact round structure needed for balance of crowded conduit insertability and flexibility, is inherently provided with the ability to bend and compress without degrading the fibers 12 .
- cable 10 of the present invention preferably employs between 6-8 yarns 22 , where their width is about 1.7 mm to 2.5 mm, and their thickness is about 0.15 to 0.40 mm.
- the tension of yarns 22 is balanced to be within 10% of the cable drawing tensions so that there is substantially no unbalanced collection of yarns 22 around tube 20 .
- This balanced assembly results in an improved yarn 22 to tensile and cold temperature contraction efficiency.
- This efficiency, or side by side positioning of glass yarns 22 provides an approximate 300 lb tension ratio at 0.5%-0.6% cable strain as compared to the typical 50-100 lb capability of un-positioned (unbalanced distribution) yarns 22 as found in some prior art arrangements.
- Yet another advantage of the present invention is seen in aerial installations.
- aerial installations it is desired to pre-strain the cable at 150 lbs to obtain the proper sag and tension over a long span.
- the arrangement of the present invention, using non-locked-in loose tube fiber 12 design is very effective at allowing the tight buffered fibers 12 to pull in from the ends to result in an unstrained fiber 12 whereas the typical prior art designs result in a momentary and long term fiber strain which, as discussed above, raise the opportunity for a fiber or glass break and signal loss.
- the design of the present invention allows an aerial installation of a central or unstranded tube 20 without resulting in an installation which results in the initial straining of fibers 12 .
- Environmental forces of wind and ice load will further strain all cable designs, however by having a lower initial stress as in the present invention, fibers 12 is less impacted by these incremental loads.
- the present invention design accomplishes such features whereby the inner diameter of loose tube 20 being approximately 10% larger than the combined diameters of the tight buffered fibers 12 a and 12 b which allows both of the fibers 12 a and 12 b to move longitudinally as needed and to the central axis during bending.
- FIGS. 6A through 6C show a cable 10 being bent.
- fibers 12 a and 12 b are sequentially in line with the intended bend of cable 10 .
- FIG. 6B because of the loose non-attached nature of fibers 12 within loose tube 20 , and because of the additional 10% larger diameter of tube 20 , tight buffered fibers (TB(s)) 12 a and 12 b are free to move to re-arrange themselves into line with eventual bend.
- TB(s) tight buffered fibers
- another advantage of a cable 10 made according to the above specifications is that the loose tube arrangement described above in conjunction with the use of water swellable powder 16 facilitates or allows fibers 12 to move longitudinally through the center of loose tube 20 during installation.
- the fiber 12 to loose tube 20 length differential tolerance is preferably in the range of 0.9982-1.0018.
- the fiber 12 to loose tube 20 length differential tolerance is preferably in the range of 0.9997-1.0003.
- There is more tolerance in the single fiber 12 design because of the additional room within tube 20 .
- tight buffered fibers 12 are able to adjust immediately after experiencing any installation induced strain so that long re-adjustment/relaxation periods are not required. Because of this, there is no need to coil the cables 10 on the line as shown in FIG. 7 .
- fiber 12 to loose tube 20 excess length varies by the difference between lengths if the inner diameter of tube 20 and the diameter of fiber or tight buffer 12 and the resulting bend or coil on the reel.
- a truly loose or unlocked tight buffer or loose fiber inside a cable when rendered onto a reel, leaves the length of fiber different than the length of the cable jacket because the fiber or tight buffer is pulled to the inner diameter of the coil on the reel.
- the relative differences of the individual fiber or tight buffer as compared to the lengths of the cable as a whole is a ratio of circumferences of the diameter (diameter of cable/diameter of fiber) ⁇ 3.1416 (PI).
- the relative difference in length can be found by comparing the relative circumferences of the cable versus the fiber of tight buffers inside.
- the present invention on the other hand, by allowing the fibers to relax immediately in the non locked-in design, set the fibers 12 in a stress free environment at the initial installation. Also the use of very low modulus filled (filled due to the flame retardant fillers) with PVC for tube 20 results in a matrix which has a low propensity to change dimension over environment variance of hot and cold temperatures.
- cable 10 arrangement of the present invention is sufficiently rigid to maintain its compact round structure and strong enough to survive installation stresses while simultaneously being of a construction such that little or no fiber strain is imparted to fibers 12 during installation.
- This reduction in strain alleviates the need for long strain adjustment periods and coiling of the cables on the utility pole, reducing overall costs.
- the elimination of the gel further reduces costs and fiber strain readjustment times.
Abstract
Description
0.9 mm+0.9 mm=1.8 mm
1.8 mm×1.1 (10%+)=1.98 mm
((0.9 mm)2*2)/(2 mm)2=0.405
Claims (16)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/600,932 US7664354B2 (en) | 2006-08-01 | 2006-11-16 | System and method for loose tube tight buffer indoor/outdoor optical fiber cable |
EP07301265A EP1890175B1 (en) | 2006-08-01 | 2007-07-23 | Loose tube tight buffer indoor/outdoor optical fiber cable |
AT07301265T ATE492829T1 (en) | 2006-08-01 | 2007-07-23 | HOLDER CABLE WITH TIGHTLY COVERED OPTICAL FIBERS FOR INDOORS AND OUTDOORS |
DE602007011360T DE602007011360D1 (en) | 2006-08-01 | 2007-07-23 | Hollow cable with tightly sheathed optical fibers for inside and outside |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US83485906P | 2006-08-01 | 2006-08-01 | |
US11/600,932 US7664354B2 (en) | 2006-08-01 | 2006-11-16 | System and method for loose tube tight buffer indoor/outdoor optical fiber cable |
Publications (2)
Publication Number | Publication Date |
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US20080031580A1 US20080031580A1 (en) | 2008-02-07 |
US7664354B2 true US7664354B2 (en) | 2010-02-16 |
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US11/600,932 Active US7664354B2 (en) | 2006-08-01 | 2006-11-16 | System and method for loose tube tight buffer indoor/outdoor optical fiber cable |
Country Status (4)
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US (1) | US7664354B2 (en) |
EP (1) | EP1890175B1 (en) |
AT (1) | ATE492829T1 (en) |
DE (1) | DE602007011360D1 (en) |
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US20140119699A1 (en) * | 2012-10-25 | 2014-05-01 | Nexans | Optical fiber cable having spline profiled insulation |
RU2540256C2 (en) * | 2013-06-05 | 2015-02-10 | ЗАО "Лазер Солюшенс" | Fibre-optic sensor of distribution of longitudinal deformations |
US11237346B2 (en) * | 2020-03-31 | 2022-02-01 | Fujikura Ltd. | Optical fiber cable |
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US7630605B2 (en) * | 2007-06-26 | 2009-12-08 | Corning Cable Systems Llc | Optical fiber assemblies having relatively low-levels of water-swellable powder and methods therefor |
US8737788B2 (en) | 2007-11-01 | 2014-05-27 | Nexans | Fiber optic cable design with improved compression test results |
US7916989B2 (en) * | 2008-07-31 | 2011-03-29 | Corning Cable Systems Llc | Optical fiber assemblies having a powder or powder blend at least partially mechanically attached |
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US8705921B2 (en) * | 2012-07-27 | 2014-04-22 | Corning Cable Systems Llc | Fiber optic drop cable |
US9669592B2 (en) | 2012-07-27 | 2017-06-06 | Corning Optical Communications LLC | Method of manufacturing a fiber optic drop cable |
US9921381B2 (en) * | 2016-02-03 | 2018-03-20 | Ofs Fitel, Llc | Loose-tube optical fiber cables |
US20220317401A1 (en) * | 2021-03-30 | 2022-10-06 | Sterlite Technologies Limited | Rewindable optical fiber cable |
CN113296210B (en) * | 2021-06-04 | 2022-04-29 | 杭州富通通信技术股份有限公司 | Light optical cable |
CN113484963B (en) * | 2021-07-08 | 2023-04-25 | 深圳市恒捷光通讯技术有限公司 | Optical fiber surplus length method and optical fiber connector installation method |
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2006
- 2006-11-16 US US11/600,932 patent/US7664354B2/en active Active
-
2007
- 2007-07-23 AT AT07301265T patent/ATE492829T1/en not_active IP Right Cessation
- 2007-07-23 EP EP07301265A patent/EP1890175B1/en not_active Not-in-force
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140119699A1 (en) * | 2012-10-25 | 2014-05-01 | Nexans | Optical fiber cable having spline profiled insulation |
RU2540256C2 (en) * | 2013-06-05 | 2015-02-10 | ЗАО "Лазер Солюшенс" | Fibre-optic sensor of distribution of longitudinal deformations |
US11237346B2 (en) * | 2020-03-31 | 2022-02-01 | Fujikura Ltd. | Optical fiber cable |
Also Published As
Publication number | Publication date |
---|---|
US20080031580A1 (en) | 2008-02-07 |
EP1890175A1 (en) | 2008-02-20 |
EP1890175B1 (en) | 2010-12-22 |
DE602007011360D1 (en) | 2011-02-03 |
ATE492829T1 (en) | 2011-01-15 |
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